<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    p {
      border: solid;
      /* width: 400px; */
      /* height: 400px; */
      width: 50%;
    }
  </style>
</head>

<body>

  <p> this is <span>tag</span> p </p>
</body>

</html>